Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 7 - Applications of Trigonometry and Vectors - Section 7.5 - Applications of Vectors - 7.5 Exercises - Page 343: 34

Answer

(a) $\langle -4,-2 \rangle$ (b) $\langle -13, 4 \rangle$ (c) $\langle 3,5 \rangle$

Work Step by Step

$U=\langle -2,-1 \rangle$ $V=\langle -3,2 \rangle$ (a) $2U=2\times$$\langle -2,-1 \rangle$ $2U=\langle -4,-2 \rangle$ (b) $2U+3V=2\times$ $\langle -2,-1 \rangle$+3 $\times $ $\langle -3,2 \rangle$ $2U+3V= \langle -4,-2 \rangle$+ $\langle -9,6 \rangle$ $2U+3V= \langle -4-9, -2+6 \rangle$ $2U+3V= \langle -13, 4 \rangle$ (c) $V-3U=\langle -3,2 \rangle$-$3\times$ $\langle -2,-1 \rangle$ $V-3U=\langle -3,2 \rangle$- $\langle -6,-3 \rangle$ $V-3U=\langle -3+6,2+3 \rangle$ $V-3U=\langle 3,5 \rangle$
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